Improvement in planing-machines



W. C. BROCKUS & C. H. BARNUM.

PLANING-MACHINE.

Patented Oct. 24, 1876.

N. PEIERS, PHOTO LI HOGR WASHINGTON n C UNITED STATES PATENT OFFICE.

WILLIAM C. BROGKUS AND CHARLES H. BARNUM, OF SPRING LAKE, MIOH.

IMPROVEMENT IN PLANlNG-MACHINES.

Specification forming part of LettersPatent No. 183,632, dated October 24, 1876; application filed August 25, 1876.

To all whom it may concern:

Be it known that we, WILLIAM (3. BEocKUs and CHARLES H. BARNUM, of Spring Lake,

luin ber longitudinally of the bed without creat-' ing undue friction, and to enable all chips and shavings to pass out with the lumber without beiugembedded in its surface by passing under the bearing-surface of the pressure-bar. To this end our invention consists in dovetailing a series of fingers into the under surface of the pressure-bar, with spaces between them for the passage of chips and shavings, as more fully hereinafter set forth.

Figure l is a perspective View. Fig. 2 is a longitudinal section atmw. Fig. 3 is a perspective view of a detached finger.

In the drawing, A represents a rigid pressure-bar, having the usual bolts a a at each end, for adjusting its plane above the bed to the thickness of lumber being planed, and also a hole, b, through which its guide-rod, at each side, passes. Into the lower surface dovetail grooves are out, which grooves are Wedge-shaped or narrower at the rear than at the front end next the cutter-head. In each is inserted adovetail finger, B, tapered slightly, so as to wedge fast in its groove when pressed back by the advancing lumber, and projecting both to the front and rear of the pressure-bar. Its bottom face is flat and parallel with the bed, and its front end is pointed and rounded up, so as not to catch in the Work, while its pointed end parts or directs chips and shavings, so that they will pass at one side, and not be carried under the finger-body to be pressed into the planed face of the lumber.

The extended bearing-surface of the fingers tends to keep or press down a warped or uneven spot firmly to a true bearing upon the bed, and in close proximity to the cutters where there is the greatest tendency to lift knots, shakes, and slivers.

What we claim as our invention is- The pressure-bar A, having the projecting fingers B dovetailed into its under surface, substantially as described.

WILLIAM G. BROGKUS. CHARLES H. BARNUM. Witnesses:

ROBERT DERR, OHANcEY STUCK. 

